Dynamic Audio Power Management - What does this option do?

Audio Gear Talk RoPieee
1

I was unable to find any explanation of this function in the usual places. Does anyone know what this option does?

Thanks!

2

This option provides a way for HAT’s (that support it) to disable output when there is not audio signal.

3

Thanks Harry!

4

@spockfish if there is no HAT, and I just have a DAC connected by USB, what does this option do?

What scenarios is it a bad idea to have it on?

Thanks!

5

DAPM is a ‘HAT only’ thingie: it makes it possible (if the chipset used on the HAT supports it/is supported) to power down the output (and the chipset) if there’s no signal.

6

Many thanks!

Now i have to figure out if my Pi2AES supports it!

John

1 Like
7

Did you find out?

8

old thread i know, but just was going through the RoPieee tabs after an update and noticed this setting…

I have a Pi2AES HAT, and it has its own power supply.

Hunted around but not seeing a definitive answer:

Does Pi2AES support DAPM?

Should I turn it on in my RoPieee settings?

What difference does it make? (Just lets it rest as opposed to being on all the time? Does it matter?)

9

DAPM makes it possible for devices like HATs that have a SoC (system-on-a-chip) on board to power down based on the audio stream.

This means that, for example on a HAT with an optical interface, the signal on the interface can be turned down, which in turn can steer your amplifier.

Now, this is all optional: certainly not all HAT’s support it, but it can’t harm to test it.

1 Like
10

thanks… when you say optical interface, you mean toslink? Guess i’m not sure what it means to “steer your amplifier”…

11

Yes, indeed.